The person spoke to USA TODAY Sports on the condition of anonymity because the diagnosis had not been announced yet. An MRI taken on Sunday revealed a Grade 3 tear, according to the person.

The loss is huge for the Warriors, who nearly stole Game 1 of their first-round series against the Nuggets but fell 97-95 when Denver point guard Andre Miller hit a layup in the closing seconds. Lee was just 4-for-14 from the field with 10 points and 14 rebounds before suffering the injury in the fourth quarter.

Lee had a phenomenal season, finishing second on the Warriors in scoring (18.5 points per game) while leading them in rebounding (11.2 per game) and earning a spot on the All-Star team.